package Multi.Multi1.Mulit_homework;

public class notebook {
    public void powerON()
    {
        System.out.println("笔记本开");
    }
    public void powerOFF()
    {
        System.out.println("笔记本关");
    }

    public void useDecive(USB usb)
    {
        usb.open();
        usb.close();
    }
}

